In this Jan. 28, 2015 photo, street signs provide directions to Old San Juan, Puerto Rico. Several hundred wealthy U.S. citizens have taken up residence in Puerto Rico, lured by incentives that allow them to pay minimal taxes on investment income in what critics say is a misguided effort to reverse a decade of economic decline that has prompted a middle-class exodus. (AP Photo/Ricardo Arduengo) (The Associated Press)

In this Jan. 30, 2015 photo, bond trader Ben Eiler poses for a photo on the second-floor balcony of his new home in Humacao, Puerto Rico. The towering 38-year-old native of Arkansas is one of at least 250 people who’ve accepted Puerto Rico’s invitation to well-heeled U.S. citizens to move to the isl...